The Port of Chester is an American port on the west bank of the Delaware River in Delaware County, Pennsylvania. Centered around Chester it ranges into Marcus Hook to the south and Eddystone to the north. It is part of the Delaware Valley port complex and lies between the Port of Wilmington and the Port of Philadelphia. Traditionally, shipbuilding and later automobile assembly were the mainstays of the port. It has since given way to other manufacturing and recreational activities, with Penn Terminals the only traditional maritime facility.

The Delaware River is a major river in the Mid-Atlantic region of the United States and is the longest free-flowing (undammed) river in the Eastern United States. From the meeting of its branches in Hancock, New York, the river flows for 282 miles (454 km) along the borders of New York, Pennsylvania, New Jersey, and Delaware, before emptying into Delaware Bay.